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3330 Data pave Delta Rancho iJ } J 1992 Suite 100 ��. ronmental Rancho Cordova CA 95870 Envi / Consultants,Inc. FA 691 1638 �N F�E1T a RVr_S FAX 918,638 8385 July 8, 1992 Ms Marla GuensIer Marketing Division Exxon Company U S A 2300 Clayton Road, Suite 1250 Concord, California 94520 Subject Quarterly Monitoring Report, Second Quarter of 1992 Exxon Station RIS No 7-3708 2705 Country Club Boulevard, Stockton, California Delta Project No 40-91-838 Dear Ms Guensler Delta Environmental Consultants, Inc (Delta), has been authorized by Ekon Company U S A . (Exxon), to conduct quarterly monitoring at the Exxon service station located at 2705 Country Club Boulevard, Stockton, California (Figure I) This letter report contains the latest quarterly ground water analytical results and water level data for this site Ground water samples and water level measurements were collected from three on-site monitoring wells (MW-1, MW-2, and MW-3) and three off-site monitoring wells (MW-4, MW-5, and MW-6) on June 4, 1992 Monitoring wells and facility locations are illustrated in Figure 2 All field activities were conducted using procedures described in Enclosure A Ground water levels measured in the monitoring wells MW-1 through MW{since August 23, 1991, are compiled in Table 1 Depth to ground water measured on June 4, 1992, ranged from 12 05 to 14 61 feet below grade The elc cations �-f the monitoring wells were surveyed using a Ca'•fornia Department of Transportation bench mark (No 1618L) which has an elevation of 0 728 feet above mean sea level Between March 18 and June 4, 1992, the ground water elevations decreased 0 72 to 0 85 foot in monitoring wells MW-1 through MW-6 Ground water level measurements collected on June 4, 1992, Indicate the direction of ground water flow across the site is to the northeast with a gradient of approximately 0 001 (Figure 3) Delta DeEivers Solutions